Stay-bolt turning and threading machine



March 11 1924.

1,486,591 c. K. LASSITER STAY BOLT TURNING AND THREADING MACHINEOriginal Filed Jan. 31, 1921 8 Sheets-Sheet 1 March 11, 1924.

C. K. LASSITER STAY BOLT TURNING AND THREADING MACHINE Original Fi ledJan. 31. 1921 8 Sheets-Sheet INVENYUR was MW,

ATTORNEY.

March 11,1924. 1,486,591

C.K.LASSHER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan.31, 1921 8 SheetsSheet 5 t m a) w '1 B: M Q

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C.K.LAS$TER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan.31, 1921 8 Sheets-Sheet INVENTOR; a if fi wsafiwr BY a v Q M ATTORNEYMarch 11, 1924; v c. K. LASSHTER STAY BOLT TURNING AND THREADING MACHINEOriginal Filed Jan. 31. 1921 8 Sheets-Sheet 5 mwsmm:

'A TTORNEY.

March 11, 1924. 31,486,593

C. K. LASSH ER S TAY BOLT TURNING AND THREADING MACHINE Original FiledJan. 31. 1921 8 Sheets-Sheet 6 W :i A

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March 11, 1924. 1,4865%1 C. K. LASSITER STAY BOLT TURNING AND THREADINGMACHINE Original Filed Jan. 31. 1921 8 Sheets-Sheet v aa'ch 11, 1924.

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Patents Mar. 11, 19:24.

COLUMBUS K. LASSITER, OF NEW YORK, N. Y.; ANNIE FRANCES LASSITER,MINISTER- TRIX OF SAID COLUMBUS K. LASSITER, DECEASED, ASSIGNOR TO DALEMACHIN- ERY COMPANY, INC., OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

Application filed January 31, 1921, Serial No. 441,276.

I '0 all whom it may concern:

Be it known that I, CoLUnnUs K. LAS- si'ricn, a citizen of the UnitedStates, residin at New York, in the county of New Yor 5 and State of NewYork, have invented new and useful li'i'iprovements in Stay-Bolt Turningand Threading Machines, of which the following is a specification.

This invention relates to a machine for in turning and threading boltblanks, and particularly to a machine for use in turning and threadingbolt blanks for the production of boiler stay-bolts of that type havinga centrally reduced or relieved portion, designed to allow the bolt tohave requisite resiliency, and threaded end portions designed to bescrewed into threaded openings in opposed boiler sheets.

Heretofore, so far as I am aware, staybolts of this type, in which theturning and threading operations have been performed on a singlemachine, and in which the threading operation has been carried out bythreading means movable lengthwise of the bolt blank, have only beenpractically made by turning and threading individual bolt blanks of theexact length and diameter required on a vertical machine, i. e., amachine in which the working tools are mounted 30 upon a head orcarriage movable downwardly by gravity on its Working motion, theforceof gravity being relied upon as the source of power for the feed motion.Such machines. while sufficiently efficient for for forming threads of acertain degree of accuracy, are comparatively slow in operation onaccount of the time and labor required in applying and removing theblanks and finished bolts, and are not, because of objections due to theuse of a gravity feed, efficient for o 'ierating upon the larger sizesof bolts or for forming threads with the high degree of accuracyrequired under some conditions. I am also aware that a machine of thehorizontal type has been suggested, but, within my knowledge, has neverbeen put into practical use, such machine being of complicated andcumbersome construction and requiring back and forth movements of boththe stock and working tools and conthreading bolt blanks up to certainsizes and.

Renewed January 11, 1924.

sequently a great number of working movements on each operation, makingit too slow and costly in construction and opera tion for practicalpurposes.

One object of the present invention is to provide a machine which, ingeneral, is more rapid in operation than prior machines, and wherebybolts with threads cut with a high degree of accuracy may be readilyproduced.

Another object of the invention is to provide a machine which willhandle and operate upon continuous bar stock, namely, a continuous rodwhich may be intermittently fed up to resent portions which are turnedand threa ed andcut off to form the finished bolts, thus reducing timeand labor in the production of the finishedarticles.

: A further object of the invention is to provide a machine of thecharacter and for the purpose described in which a positive, accurate,and regular feed action of the threading tool is ensured, to effect theproduction of bolts with threads out to a very high degree of accuracy.

A further object of the invention is to provide a machine of thecharacter and for the purpose described whereby the turning andthreading tools may be controlled with facility and the threading actiongoverned so that the bolt may first be turned and its end portions thenthreaded. and the lead of the threads of such end portionsaccuratelypreserved.

A still further object of the invention is to provide a novelconstruction and organization of parts whereby a machine of thehorizontal type, such as of the turret-lathe type, may be advantageouslyused. and positive power mechanism employed for actuating the threadingand turning devices.

\Vith these and other objects in view, which will appear in the courseof the sub joined description, the invention consists of the novelconstruction, combination and arrangement of parts hereinafter fullydescribed and claimed. reference being had to the accompanying drawings,in which Figure l is a view in side elevation of a bolt turning andthrcadingmaehine embodymg my invention.

Figure 2 is an enlarged sectional plan view of the feeding andcontrollin mechanism mounted upon the tail-stock of the machine. V

Figure 3 is a vertical longitudinal section on the line 33 of Figure 2.

Figure 4: is a vertical transverse section on the line 1 -4 of Figure 3.

Figure 5 is a vertical transverse section on the line 5--5 of Figure 2.

Figure 6 is a vertical transverse section on the line 6-=-6 of Figure 2.

Figure 7 is a detail section through the handle of the speed controllinglever of the tool driving and controlling mechanism the tail-stock.

Figure 7 is a detail view of a trip device.

Figure 8 is a vertical longitudinal section through the tail-stock,showing the means for locking, releasing and turning the turret.

Figure 9 is a longitudinal section throu h the chuck end of the workholding spindle.

Figure 10 is a section on the line 10-10 of Figure 2. i

Figure 11 is a front elevation of the turnin tool.

*igure 12 is a side elevation thereof.

Fi re 13 is a detail section taken substantially on the line 13-43 ofFigure 11.

Fi re 14 is a detail view of parts shown in Figures 11 and 12.

Fi re 15 is a longitudinal section showing t e stock feeding and chuckopening and ing tie steps of manufacture of the stay may be employed.The gearing 5, exposed parts only of which are shown, transmits motionto a. longitudinally extending main drive shaft 6 through the medium ofa train of transmission gears 7 arranged in a gear casing 8. The gearing7 maybe of a type which admits of the interchangeable use ofintermediate change-speed gears in the train whereby the shaft 6 may bedriven at any proper speed for operating the threading tool, hereinafterdescribed, at any proper speed suitable for cutting a thread of anydesired pitch. The drive gearing includes as part thereof a controllinglever 9 adjustable to the three positions a, b and c, the po sition abeing a neutral position in which the shaft 6 is thrown out of actionand the positions I) and 0 high and low speed 3081- t-ions,respectively. The stock 10, from which the bolts are to be formed,consists of a copper or other metal rod which is fed up through asliding chuck controlling tube 11 contained in the spindle. At theforward end of the spindle is a chuck head 12 receiving a stock clampingcollet 13 of that type slotted to provide spring jaws carrying renewablebushing sections 13 secured thereto by screws 13, said bushing sectionsbeing adapted to close aboutand grip the rod when the tube 11 is movedforwardly and to release the rod when the tube 11 is moved rearwardly.Extending from the headstock is a support 14 on which is slidablymounted a sleeve connected to an actuating rack bar 1.6 and adjustableforwardly and rearwardly by means of a pinion 16 meshing with the teethof said rack bar, said pinion being carried by a shaft 17 operable by ahand wheel 17'. The sleeve 15 is provided with a forked portion 18engaging the grooved portion of a sliding conical or wedge collar 19arranged to operate upon elbow levers l9 engaging the rear end of thetube 11. Connected with the sleeve 15 is a ratchet feed bar 2O slidablein a groove in the support 14-, the teeth of which bar are adapted to beengaged by a pawl or dog 21 on the stock feeding sleeve 22. This sleeve22 engages a collar 22 fixed to the stock 10 by a set-screw 22". Whenthe hand wheel 17 is'operated to slide the actuating rack bar 16 andfeed ratchet bar forwardly, the wedge collar 19 releases the tube 11,allowing the collet 13 to open and release the stock. and the bar 20, byengagement of one of its teeth with the dog 21, transmits movementthrough the sleeve 22 and collar 22* to feed the stock forward therequired distance.

On a reverse movement of the hand wheel 17 to slide the bars 16 and 20and wedge collar 19 rearwardly, the bar 20 slides through the sleeve 22without affecting the same. as the dog 21. rides over the ratchet teeth.said parts thus moving backwardly for the subsequent feed-up action,while the wedge collar 19 actuates the levers 19 to slide the tube 11forward to cause the collet 13 to close and grip the stock. The stock isthen held for rotation with the spindle 4.

The support 14 may have one or more standrests 23, either one or both ofwhich may carry a roller-rest to support the rear or floating end of thestock. In the present instance one such stand-rest 23 is shown suportinga roller-rest comprising a bearing racket 24 provided with a hinged armor cap 25 forming therewith a guideway for the stock. This bracketcarries a pair of rollers 26 on and between which the stock rests andthe arm 25 carries a roller 27 arranged to bear upon the upper surfaceof the stock on a vertical line between the vertical planes of therollers 26, such rollers bearing lightly on the stock to stably supportthe same while allowing it to revolve freely with the spindle whenclutched there to. At its hinged end 28 the arm 25 is provided withastop 29 to limit its opening movement and the opposite end of the arm isslotted or bifurcated to receive a swingbolt 30 having a clamping nut31, whereby the arm may be easily and quickly secured in closed positionor released for opening movement. An adjustable stop screw 32 isprovided on the bracket to limit the closing movement of the arm andregulate the frictional bearing contact of the rollers on the stock.This roller-rest effectually sustains the weight of the floating end ofthe stock to prevent it from bending or binding, while allowing it tofreely rotate with the spindle and properly centering it for the turningand threading actions.

From the foregoing description of the parts upon the headstock of themachine, it will be understood that the stock rod 10 may be properlyadvanced beyond the chuck to form a bolt blank portion of proper lengthto be operated upon to form the bolt, as shown in Figure 1, the stockgripped for vrotation with the spindle for cooperation with suitableturning and threading tools movable endwise along said blank, and thespeed of rotation of the stock and rate of endwise feed of said toolsgoverned and regulated according to the pitch of the thread which is tobe formed. A suitable cut-oil is provided whereby the completed bolt mabe severed from the body of the stock. This may be of a type commonlyemployed in screw machines, the same including a cutting tool 33coacting with a suitable backing cutter (not shown) and mounted upon aholder 34 carried by a slide 35, said slide being adjustablelongitudinally of the frame by adjusting means operated by a hand wheel36, and said holder being adjustable transversely ofthe. machine for.cutting and receding actions by adjusting means operated by a hand wheel37. I have not deemed it necessary to illustrate the cut-ofi in detail,as any suit-able or known type of cut-off adapted for the purpose may beemployed.

Mounted upon the tail-stock is a turret 38 revolubly supported upon aslide or car riage 39, said turret rotating upon an axis 40. The turretis provided with at least three work faces for the reception of acorresponding number of work devices, to wit, a stock stop 41, a turningcutter 42, and a threading die 43, but, as shown in the presentinstance, a turret of hexagon type is preferably employed having thework faces (l, e, f, g, h, 2', on which may be mounted two sets of workdevices of the character described, which are arranged in proper orderfor successive use in the rotation of the turrot. This permits of a morerapid indexing action when the machine is used for staybolt productiononly and for the omission of one set of the work devices if it should bedesired to employ the machine for special work on the stock or for otherkinds of Work for which the machine may be adapted. Sockets 44 areprovided in the turret to receive tools having shanks to be fittedtherein, and adjustable stops at, e, f, g, h, 71', arranged for use inconnection with the respective turret faces, are mounted upon a rotaryhead 39 carried by the slide 39, said head being coupled to an indexingshaft 45 for rotation therewith, which shaft carries a bevel gear 46meshing with a similar gear 47 on the turret whereby when the turret isturned for an indexing action, i. e., to bring a certain working faceinto working position, the series of stops will at the same time beturned to bring the proper stop into po sition for use. Each active stopis adapted, at the limit of the working movement of the slide when suchstop which coacts with said certain working face is in position, toengage a trip arm 48 upon a transverse rock shaft 49, whereby the turretfeed mechanism is thrown out of action, as hereinafter described. Theturret is provided with a series of keeper sockets 50, one for each ofits work faces, adapted to receive a vertically movable plunger pin orlooking bolt 5], whereby the turret is locked against rotation in itsworking positions. The bolt 51 is carried by the slide 39 and ispivotally connected y with one end of a centrally pivoted lever 52, aspring 53 being provided to normally hold the lever in bolt-projecting(locking) position. The other end of the lever has a contact portion 54arranged for cooperation with a trip member 55 mounted on the tail stockframe, said trip member having an inclined or cam surface 56 and ahorizontal supporting surface 57. \Vhen the slide 39, after making aworking movement forward, is reversed and nears the limit of its returnmovement, the contact member 54 engages and rides upward on the surface56, thus retracting the bolt 51 and freeing the turret, and then stopsand rests upon the surface 57 so as to hold the bolt retracted while theturret is being indexed or turned to the next working position. On thesucceeding forward movement of the slide the bolt is released in anobvious manner and locks the turret in such position. The turret carriesthe indexing pins 58-, corresponding in num her and working relation toits work faces, which pins are adapted to be successively engaged andactuated to turn the turret by means of an index lever arm or dog 59.This arm or dog is pivoted at its rear end, as indicated at 60, so as tohave a limited degree of lateral swinging movement to the extent allowedby a stop pin 61 and recess 62, a spring 62 serving to hold said arm innormal position. The forward or free end 63 of the arm is suitablycurved or notched for engagement with the pins 58. Upon the retractionof the bolt 51 and release of the turret as the slide 39 nears the limitof its return movement, the pin 58 then in position engages the end 63of arm 59 whereby, in the final portion of such movement of the slide,the turret is turned to its next working position. In this operation thearm yieldingly swings against the resistance of its spring 62 to asufiicient degree to conform to the arc of movement of the engaged pin.On the next forward movement of the slide the arm 59 is reset by spring62' to engage the next succeeding pin 58 of the series, as will bereadily understood.

When the turret is in its first position,

the stock stop or gauge 41 is presented for use as a preliminary to thefeeding up of the stock 10 by the stock feeding and grip-" pingmechanism, said stop gauging the extent of projection of the end of therod 10 to form a bolt--blank of proper length for use. The turret isthen turned to the second position to bring the turning or relievingtool 42 in position for use to first form the concaved, relieved orturned portion 10 upon the center of the bolt-blank, after which thetool 42 is retracted and the turret turned to the third position topresent the threading tool for use in forming the threads 1O upon theends of the blank, the bolt then being cut off from the body of thestock by operating the cut off device 38. During these operations thestock is revolved through the action of the spindle drive gearing, aspreviously explained, and the turret slide is operated and controlled tosuecessively cause the turning and threading tools to move lengthwise ofthe blank for the turning and threading operations through the medium offeeding and controlling mechanism on the tailstock. the construction andoperation of which I will now proceed to describe.

Journaled upon the carriage or slide 37 is a lead screw 64 which isengaged by a worm-toothed gear feed nut 65 journaled in fixed bearingsupon the tail-stock and meshing with a worm 65 (see Figure i) on :1

casing 67 receiving one end of the shaft 66 and in which the adjacentend of themain drive shaft 6 is received and journaled. On said end ofsaid shaft 66 is fixed a double gear having beveled gear teeth 68 andspur gear teeth 69. Extending longitudinally within the casing 67 aretwo other shafts, a primary transmission shaft 70 and a secondarytransmission shaft 71. Fixed on the shaft 6 are high and low speed gears72 and 73, and feathered to slide upon and rotate with the shaft 7 0 isa grooved sleeve 74 carrying high and low speed gears 75 and 76. Thesleeve 7-1 is shiftable, by means of a forked crank arm 77 operable by aspeed controlling lever 78, to throw the gears 7572 into mesh for a highspeed action, or the gears 7 67 3 into mesh for a slow speed action, orto dispose said gears 75 and 76 in a neutral position. Lever 78 has ahollow handle shank 79 enclosed by a sliding handle sleeve 80 andenclosing a locking bolt 81 and its projecting spring 82, which bolt isadapted to be retracted by an outward sliding movement of said sleeve.The bolt when projected is adapted for engagement with any one of threekeeper recesses 83, 84 and 85 in a lock plate on the casing 67 to lockthe lever, and consequently the gears 75 and 7 6, respectively, inneutral, low and high speed positions. This lock plate also serves as anindicator for determining the position of lever 78, and it may be statedthat when lever 78 is in position 84 the gearing is set for driving themechanism at boltturning speed and when said lever 78 is in position 85the gearing is set for driving the mechanism at threading speed. F ixeddirectly to shaft 70 is a third gear-'86 which is in constant mesh witha gear 87 carried by a sleeve 88 loosely mounted on shaft 71, whichsleeve also carries a clutch pin 89 forming one part of a one-revolutionclutch.

When either one of the speed gears on the shaft 70 is in mesh with itscompanion gear on shaft 6 it will be evident that, assuming that shaft 6is in motion. shaft 70 and sleeve 88 will be constantly driven at high(turning) or low (threading) speed, but that shaft 71 until clutched tosleeve 88, will stand idle. O-n shaft 71 is fixed a beveled gear 89which meshes with the beveled gear member 68 of the double gear on shaft66, and feathered to slide upon and rotate with said shaft 71 is agrooved clutch sleeve 90 carrying a clutch pin 91' for cooperation withthe pin 89 and forming the other working part of the one-revolutionclutch. When said clutch pins 89 and 91 are engaged, low

or high speed motion will be transmitted through shaft 71, shaft 66 andnut 65 to the lead screw 64 for driving the slide or carriage 37 in aforward direction. Sleeve 90 is engaged by the forked crank arm of arocking clutch lever 92 having an operating handle 93, carrying a latchpin or stud 94 to engage a cooperating latch member 95 on one (theouter) end of a nonrotary slidable throw-off or releasing shaft 96.Shaft 96 has its inner end (see Figure 6) in sliding engagement with theadjacent end of shaft 49, with which it isin lon itudinal alinement, andon said shaft en ds are collars or heads 97 and 98 having spirallydisposed cam surfaces. A coiled spring 99 surrounds the outer end of theshaft 49, between the head 98 on the shaft 96 and the inner wall ofcasing 67, and nor mally forces (slides) the shaft 96 outward to holdthe latch member 95 projected and to also maintain the head 98 infrictional contact with the head 97 so that trip 48 is normallymaintained in its upright working position. When any of the stops d, e,etc., comes in contact with the trip 48, at the limit of a forwardworking movement of the turret slide or carriage, the shaft 49 is rockedin a forward direction, causing the cam head 97 to force the cam head 98rearwardly against the resistance of spring 99. Such action will causeaninward sliding movement of shaft 96, withdrawing latch member 95 fromunder latch member 94 and releasing the clutch lever 92, which will dropby gravity to a lowered position. By this operation of lever 92 clutchsleeve 90 will be retracted, withdrawing clutch member 91 fromengagement with clutch member 89 and throwing shaft 71 out of action.will be arrested and the slide or carriage 37 will come to a stop. Whenthe carriage is reversed and the pressure on the trip 48 of the carriagestop is relieved, the spring 99 resets the trip device and throw-off.The latch members 94 and 95 are provided with beveled faces to allow thelatch member 95 to be forced inward by the latch member 94 when lever 92is swung up to clutching position, spring 99 yielding and then forcingthe latch member 95 out for the lever locking action. It will beobserved that this clutch throw-off action is performed withoutaffecting the action of the drive gearing, which is controlled by theoperation of the lever 78. Journaled upon casing 67 is a shaft 100carrying a hand wheel 101 by means of which it may be operated. Fixed tothis shaft is a spur gear 102 which meshes with the spur gear pinionmember 69 of the double gear on shaft 66. The gears 69 and 102 provide agear connection between shafts 66 and 100 which is of higher speed ratioHence the operation of shaft 66 rection at accelerated speed byoperation of The operator may,

the hand wheel 101. therefore, quickly reverse the carriage at the endof a working operation or move the carriage back and forth for a rapidturning of the turret for indexing actions as occasion may require.

The stock gauge stop or stops 41 may be of any preferred type andmounted in any preferred way upon the proper face or faces of the turret38. The turning tool or tools 42 employed may also'be of suitableconstruction, a preferred form of box mill type being illustratedgenerally in Figures 11 to 14, inclusive. As shown said tool comprises asuitable body 103 having an opening 104 to-receive the end of the stock,a cutting tool 105 to act upon the stock and rollers 106 to. bear uponthe stock opposite said tool and properly back and center the stock withrelation thereto. The tool 105 is mounted in a support 107 pivoted at108 to the body 103, said support being connected with a binder member109 movable'in an'arcuate slot 110 in the body so that the cutter may beadjusted to cut to a suitable depth, and a handle 111 being provided foradjusting said support and actuating the binder member to secure thesupport in adjusted position. The binder member 109 shown in the presentinstance comprises a stem extending loosely through the slot 110 andhaving the actuating handle 11.1 at one end, its opposite end beingthreaded to engage a threaded opening in the support 107, whereby saidsupport may be released for adjusting movements and then clamped. A stopscrew 112 may be provided for limiting the outward swing of the supportand setting it for working adjustment. The rollers 106 are carried byslides 113 radially adjustable toproperly position the rollers accordingto the size of the stock and to regulate their pressure thereon. In theturning action the carriage 39 feeds forward until the end of the stockenters the opening 104 and the tool 105 reaches the proper point in thelength of the presented blank to begin the cut, at which time the toolis set to cut into the stock and form the relieved portion 10 as thetool travels along the stock. When the proper point to terminate the cutis reached the proper stop 0 engages the trip 48 and releases the clutchlever 92 to stop the feed motion of the carriage 39. The tool 105 isthen retracted, the carriage 39 reversed to starting position, and theturret 38 turned to bring the threading tool 43 into position for use,the construction and operation of which I will now proceed to describe.

As shown particularly in Figures 19 to 22,

inclusive, the threading tool 43 comprises a die body 114 having anaxial opening 115 in alinement with the bore of a hollow shank 116,which shank is suitably fixed to said body and is adapted to be fittedand secured in the proper turret socket 44. The axial opening 115 andhollow shank form a passage to receive a-bolt blank of any requiredlength to be threaded and which allows the tool to enclose and travelalong (lengthwise of) the bolt-blank. Fixed to the shank 116 is a head117, against which the rear surface of the body 114 normally bears. Thebody 114 is slidably mounted for back-and-forth movement on the shank116 but is connected with the head 117 by the driving pins 118 and theguide bolts 119 which allow the body to have the sliding motiondescribed while holding said body against rotation relative to the shankand head. Springs 120 are provided for cooperation with bolts 119 toreturn the body, after forward sliding movement, to normal position; Thebody is provided with suitable guideways for radially movable andadjustable chaser dies 121, said dies being carried by the slidingdie-carrierblocks 122 adapted to be moved outward or retracted bysprings 123. Rotatably mounted on the body is a cam die closing ring124,

provided with the closing handles or pins 125. This cam rin is providedwith recesses 126 into whic the outer ends of the blocks 127 may recedein the opening movement of the dies, and the walls of said recesses 126and the outer ends of the blocks are respectively provided with inclinedor cam surfaces 128 and 129 whereby, through a prescribed rotarymovement of the ring 124 the dies may be moved inward to threadingposition. Springs 130 are employed to move the ring 124 to die openingposition, which springs are tensioned when the ring is moved to dieclosing position for subsequent reaction to move the ring to die openingposition. Coupled to the head 117 for a limited rotary movement, andagainst longitudinal sliding movement, is an adjusting and locking ring131, adjustable by means of the micrometer screws 132. This ring 131 isprovided with a spring-actuated locking belt 133 to engage a lockingshoulder 134 on the cam ring 124, whereby said cam ring is locked in dieclosing position. The position of this bolt may be varied by adjustmentof the ring 131, so that the extent of die-closing and locking movementof the ring 124 may be varied to compensate for wear of the'dieswhenever this becomes necessary, as well as m vary the depth of theformed threads it so desired. Secured to the body is the usualdust-cover 135. The bolt 133 has an outwardly projecting threaded stem136 engaged by a setnut 137 having an adjusting handle 138, by means ofwhich the forward extent of rejection of the bolt under the action orits spring may be regulated. When the threading tool is in action andnears the limit of its working movement, at which time the motion of thecarriage is arrested by its proper work-stop, the continued rotation ofthe stock 10 will cause the chasers to continue to cut and travel alongthe stock, carrying with them the die body 114, said die body and thecam ring joint-l sliding forward on the shank, until the ocking shoulderof the camv ring passes out of engagement with the looking bolt 133. Thecam ring is then freed for reverse rotary movement under the action ofits springs 130, whereby the dies are released for openin movement.Springs 120 then return the die body and cam ring to normal position,-in readiness for the subsequent die closing-and threadin operations.

In the operation or the organized machine assuming that a bar or rod 10of stock is in position to be fed up, and the drive gearing upon theheadstock is set into action, the operator actuates the stock feed andchuck mechanism to advance the forward end of the stock to a sufiicientdegree to form a bolt blank and to grip the stock for rotation by andwith the spindle. In this operation it is to be assumed also that theturret 38 is arranged to dispose the stock stop 41 in position to a thebolt blank. The stoc: being fed up, the

turret 38 is then turned to bring the turning tool 42 into operativeposition and lever 78 adjusted to osition 84 to set the high speedgearing o the turret slide feed mech--- anism into action and the lever92 set to throw the one-revolution clutch into operation to communicatemotion to the turret slide or carriage. When the tool 42 reaches theproper position on the bolt blank, the cutting tool thereof is projectedfor operation to form the turned or concaved portion 10, the motion ofthe carriage being arrested by the proper slide stop when the end of theturning out is reached, whereupon the turning cutter is retracted, thecarriage reversed by means of the carriage reverse mechanism, and theturret 34 turned to bring the threading tool 43 into working position.It will of course be understood that at the end of the turning operationthe carriage stop effects a cessation of e the length of IOU themovement of the carriage by the autoria e and the movement of thethreading tool 43 longitudinally of and along the bolt blank theterminal portions of the blank will be formed with the threads 10", asshown in the completed bolt disclosed in Figure 25. During the threadingoperation the lever 78 is adjusted to the position 85 to throw the lowspeed drive gearing of the carriage into action, and lever 92 adjustedto set the clutch, and this rate of peed may be preserved throughout theentire operation of threading the bolt blank. In order to secure increased speed, however, it will be understood that during the travel ofthe threading dies along the turned portion 10 lever 78 may be adjustedto the high speed position 84, so that between the first and finalthreading actions on the respective bolt ends the threader may travelwith increased speed during the intermediate idle portion in its rangeof threading movement. At the cessation of the threading operation theproper carriage stop comes into position to effect the release of thelever 92, whereby the onerevolution clutch is thrown out of action,whereupon the lever 7 8 may be moved back to neutral position 83, or tospeed position 84, as desired. The bolt blank having been threaded andturned, as above described, the cutting tool 33 is now brought intoaction to sever the completed bolt from the body of the stock 10, afterwhich the stock is fed up and the parts of the mechanism properlydisposed for a repetition of the above described operations in turningand threading the succeeding bolt blank. It will be evident from theforegoing description that as the carriage i operated on its workingmotion by positive drive mechanism through a gear nut and lead screw,while the stock is revolved at a prescribed coordinated rate of speed,positive and etlicientturning and threading actions of the turning andthreading tools upon the bolt blank will be obtained. Also it will bereadily understood that in threading thebolt blank the lead of thethread between the separate thread portions thereof will be preserved, afeature of primary importance in the manufacture oi bolts of thischaracter, while at the same time a high degree of accuracy in the cut--ting of the threads is secured. By the provision of a machine of thecharacter disclosed the objections to prior machines of the verticaltype, and in which the working tools have a gravity feed, areeffectually over-- come, the output of the machine increased, and abetter and more perfect product obtained. Also, as there are no back andforth movements of the stock to prescribed working positions, or complexmeans for adjusting the sameor the working tools into and out of workingpositions, simplicity of construction and working action is secured,

- and at the same time the high speed mechanism allows rapid return ofparts to starting position after each working step, making the machinesimpler, and less costly in construction as well as more re id and lesscostly in operation, than prior machines of horizontal type heretoforesuggested.

It will, of course, be understood that while the construction andarrangement of parts disclosed is preferred, suitable changes andmodifications may be made such as clearly fall within the spirit andscope of the invention as defined in the appended claims. Also that,while the machine is primarily designed for the purpose described, itmay also be employed for any other purpose or use for which it may befound to be adapted.

' laving thus fully described the invention, I claim:

1. In a machine for turning and thread ing stay bolts, the combinationof means for intermittently feeding up a continuous stock rod,successive portions of which are to be turned, threaded and severed fromthe remainder of the stock to form the bolts,

ately turning and terminally threading a portion of the stock rodpresented for treatment by a working movement of said devices lengthwiseof said stock,'power means for applying a positive'working travel tosaid carriage, and means for-cutting 013' the formed bolt from the bodyof the stock.

2. In a machine for turnin and threading bolt blanks, the combination ofmeans for holding and rotating a bolt blank, a cutter for endwisemovement in one direction along the bolt blank for concaving said blank,a threader for endwise movement along the bolt blank in the samedirection as the cutter for successively threading the blank at oppositesides of the concaved portion formed by the cutter, both the cutter andthe threader being operative upon the blank while .the blank is rotatingbut held from endwise movement, a carriage for supporting the cutter andthe threader on which said tools are mounted so as to be adjusted intoand out of working position,

and aring for driving said carriage on a working travel to move thetools along the endwise stationary but rota-ting bolt blank.

3. In a machine for turning and threading bolt blanks, the combinationof means for holding and rotating a bolt blank, a

cutter for endwise movement in one direction along the bolt blank forconcaving said blank, a threader for endwise movement along the boltblank in the same direction as the cutter for successively threading theblank at opppsite sides of the concaved poring including a lead screwcoupled to the carriage and a nut in gear with said lead screw.

4. In a machine for turning and threading bolt blanks, the combinationof means for holding and rotating a bolt blank, a cutter for endwisemovement in one direction along the bolt blank for concaving said blank,a threader for endwise movement along the bolt blank in the samedirection as the cutter for successively threading the blank at oppositesides of the concaved portion formedby the cutter, both the cutter andthe threader being operative upon the blank while the blank is rotatingbut held from endwise movement, a carriage for supporting the cutter andthe threader on which said tools are mounted so as to be adjusted intoand out of working position, a load screw coupled to the carriage, a nutfor driving said lead screw, high and low speed gearings for driving thenut, manually operable means for setting either the high or the lowspeed gearing into action, and means for automatically throwing saidsetting means out of action at the limit of a working travel of thecarriage.

5. In a machine for turning and thread ing bolt blanks, and incombination with a suitable frame, and means for supporting and rotatinga bolt blank while holding said bolt blank from longitudinal movementduring turning and threading actions, turning and threading toolsarranged to be presented for successive turning and threading actions onthe bolt blank in which said tools travel in one direction along therotating but longitudinally stationary bolt blank, a carriage supportingsaid tools, a lead screw on said carriage, a gear nut on the frame andengaging the lead screw, drive mechanism for actuating the gear nut, andmeans for driving the gear nut from the drive inechanism at variablespeeds.

6. In a machine for turning and threading bolt blanks, the combinationof means for holding a bolt blank, means for feeding up said bolt blankto successively expose portions thereof for turning, threading andsevering actions, means for rotating the bolt blank for working actionsthereon while holding said bolt blank against longitudinal movement, acarriage having a working travel along the rotating bolt blank, aconcaving tool on said carriage, a threading tool It ,itaesei on saidcarriage, said concaving and threading tools being arranged so as to bepresented for successive actions to concave a portion of the blank andsuccessively thread portions of the blank on opposite sides of saidconcaved portion thereof in the travel of the carriage in one directionalong the rotating blank, a lead screw mounted upon and movable with thecarriage, a gear nut engaging said lead screw, a continuouslyrotatingdrive shaft, a primary transmission shaft, manually adjustablehigh and low speed gearing for coupling the drive shaft to the primarytransmission shaft, a secondary transmission shaft for driving the gearnut, a clutch device for connecting said secondary transmission shaftwith the primary transn'iission shaft, an operating element for settingsaid clutch device for action, and automatic means actuable at the endof a turning or threading cut for shifting said operating element forthrowing said clutch device out of action.

7. In a machine for turning and threading stay bolts, the combinationwith a suitable supporting frame, and means for rotating a bolt blankwhile holding it from longitudinal movement, of a carriage having aWorking travel in one direction longitudinally of the blank, threadingand turning devices mounted on the carriage for successive adjustmentsto working positions in successive working travels of said carriage, anda power mechanism for driving said carriage, said power mechanismincluding a lead screw on the carriage and a nut on the frame inengagement with said lead 8. In a bolt turning and threading machine,the combination of means for supporting and rotating a bolt blank whileholding it from longitudinal movement, a carriage having a workingtravel in one direction along the rotatable but endWise erable mechanismfor actuating said shaft independently of said drive mechanism for areversing the carriage.

9. In a bolt turning and threading machine, the combination of means forsupporting and rotating a bolt blank while holding it from longitudinalmovement, a

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reactor carriage having a working travel in one di: rection along therotating but otherwise sta tionary bolt blank, turning and threadingtools upon the carriage adjustable so as to be successively presentedfor use for successively turning a portion of the bolt blank andthreading said blank at opposite ends of the turned portion onsuccessive working travels of the carriage, a lead screw mounted on andmovable with the carriage, a gear nut engaging said screw, a carriagedrive shaft for transmitting motion to the gear nut, a primary driveshaft, manually controlled sets of gearing operative for driving thecarriage drive shaft at different speeds from the primary drive shaft,and manually operable gearing for transmitting motion to the carriagedrive shaft independently of said sets of speed gearing for reversingthe direction of travel of said carriage drive shaft and the carriage.

10. In a machine for turning and threading stay bolts, the combinationof means for supporting and rotating a bolt blank while holding it fromlongitudinal movement, a carriage having a working travel in onedirection along the bolt blank, turning and threading tools mounted onsaid carriage and arranged to be successively presented for concaving aportion of the blank and threading the blank at opposite ends of theconcaved portion on successive working travels of the carriage along thebolt blank, drive gearing for imparting working motion to the carriage,a clutch device for throwing said drive gearing into and out of action,a handle for actuating said clutch device, a latch for holding thehandle to maintain the clutch in working position, and means operativeon a prescribed working motion of the carriage for tripping andreleasing said latch.

11. In a machine for turning and thread ing stay bolts, the combinationof means for supporting and rotating a bolt blank while holding it fromendwise movement, a carriage having a working travel in one directionalong the bolt blank, turning and threading tools supported by thecarriage, a lead screw on the carriage, a gear nut engaging with saidlead screw, a shaft for driving the gear nut, a primary drive shaft,primary and secondary transmission shafts, gearing for driving theprimary transmission shaft at high or low speed from the primary driveshaft, a gear element on the secondary transmission {shaft constantlydriven from the primary transmission shaft when said primarytransmission shaft is in action, gearing between the secondarytransmission shaft and the nut actuating shaft, a manually operableclutch device for fixing said gear element to said secondarytransmission shaft, a latch device for holding said clutch device inengaging position, and

means operative on a prescribed travel of the carriage for tripping andreleasing said latch device.

12. In a machine for turning and thread ing stay bolts, the combination,with means for holding and rotating a bolt blank, of means for turningthe central portion of the bolt blank, means for threading the terminalportions thereof, a carriage having a working travel in one directionalon the bolt blank, turning and threading too on said carriage, a leadscrew upon the carriage, a gear nut engaging said screw, and means fordriving said gear nut.

13. In a machine for turning and threading stay bolts, the combination,with 'means for holding and rotatin a bolt blank, of a carriage having awor ing travel in one direction along the bolt blank, a turning toolupon the carriage for turning the intermediate portion of the boltblank, a thread ing tool upon the carriage for threading the terminalportions of the bolt blank, gearing for driving said carriage, powermechanism for driving said gearing, and means for varying the speed ofsaid gearing for the turning and threading cuts.

14. In a machine for turning and threading stay bolts, the combination,with means for holding and rotating a bolt blank, of a carnage having aworking travel in one direction along the bolt blank, a turning toolmounted on therearriage, a threading tool mounted on the carriage, drivegearing, transmission gearing for transmitting motion from the drivegearing at relatively different turning and threading speeds, means fortransmitting motion from said transmission gearing to the carriage, andmeansfor throwing said means out of action without affecting said drivegearing and transmission gearing.

15. In a machine for turning and threading stay bolts, the combination,with means for supporting and rotating a bolt blank while holding itfrom longitudinal movement, of a carriage having a working travel in onedirection along the bolt blank, a turning device upon the carriage forcentrally reducing the bolt blank, a threading device upon the carriagefor threading the terminal portions of the bolt blank, and gearing fordriving the carriage at different turning and threading speeds, saidgearing being operative for driving the carriage at the higher turningspeed during the movement of the threading device over the reducedportion of the bolt blank.

16. In a machine for turning and thread ing stay bolts, the combination,with suit able supporting frame, and means for holding and rotating abolt blank, of a carriage having a working travel in one direction alongthe bolt blank, turning and threading devices mounted upon the carriage,gearing embodying a lead Screw and nut for driving the carriageuniformly at any predeter-- inined speed, and means for varying thespeed of said gearing.

i 17. In a machine for threading and turning stay bolts, thecombination, with asuitable supporting frame, and means for holding androtating a bolt blank, of a carriage having a-worklng travel in onedirection longitudinally of the bolt blank, turning --and threadingdevices mounted on the car- 'riage, gearing for driving the carriageembodying a lead screw on the carriage and anut on the frame engagingtherewith, a

15.-variable speed power mechanism for driv- '-'-in said gearing, andaclutch for throwing said' gearing into and out of connection with saidpower-mechanism. 18. In a i'nachinefer turning and threading stay bolts,the combination, with a suitable supporting f'lfiame, and means forholding and rotating a bolt blank, of-a carriage having aworking travelin one direction longitudinally of said bolt blank while said blank isbeing rotated-but held from longitudinal movement, turning and threadingdevices, on the carriage, gearing for driving the-carriage embodyinga-lead screw on the carriage and a nut on the frame engaging therewith,a variable speed power mecha- 'nism for driving said gearing, a clutchfor connecting said' gearing with and disconne cting it' from the powermechanism, and 'RTIQBJIST automatically operativeon a predeterminedmovement of the carriage for throwing the clutch out of action. 19. In abolt-turning. and threading machine, the combination of a boltblanksupport, a tool support, turning and threading 40 tools mounted thereon,means for producing relative rotation between the bolt blank and thetool acting thereon, and means for producing relative movement betweenthe bolt blank and the tool acting thereon by travel of said tool alongand in one direction of length of 'saidblank while relative rotation -isoccurring and theblank isfixed against longitudinal movement, said meansembody-' ing a lead screw coupled to and movable with the tool, a nutacting thereon, and

drive gearing for actuating said nut.

20. In abolt turning and'threading machine-the combination of abolt'blank support, a tool support having a working travel in,one'direction "longitudinally of the bolt blank, turning and threadingtools mounted on said support, means for producing relativerotation-betweenthe bolt blank and the tool acting thereon,-'and meansfor producing relative movement between the bolt blank and the'tool'ac'ting-thereon through the travel of the support in .thedirection-of length of said blank while the-latter is fixed againstlongitudinalmovement, said means at embodying a lead screw coupled tothe tool support, a nut acting thereon, a drive shaft, a driven shaftfor actuating the nut, and means for operating the driven shaft from thedrive shaft at varying speeds.

21. In a machine for turning and threading bolt blanks, the combinationof means for supporting and rotating a bolt blank while holding it,during rotation, from endwise movement, a carriage having a workingtravel in one direction longitudinally of the bolt blank, turning andthreading too'ls mounted upon the carriage and adapted to besuccessively presented for respectively concaving the bolt blank andthreading portions of the blank on opposite sides of the concavedportion on successive working travels of the carriage, a lead screwcarried by and movable with the carriage, a gear nut engaging said leadscrew, a carriage drive.-

one fixed to said loose gear and the other tosaid primary transmissionshaft, a lever for moving one of said clutch members into and out ofworking position, a latch for holding said lever in clutch engagingposition, and a trip device operable at a point in the working travel ofthe carriage for automatically releasing said latch.

22. In a bolt turning and threading machine, the combination of a boltblank support, a tool support, turning and threading.

tools mounted thereon, means for holding the blank against longitudinalmovement while producing relative rotation between the bolt blank andthe tool acting thereon, and means for producing relative movementbetween the bolt blank and the tool eacting'thereon by travel of thetool support in one direction of length of said blank-said meansembodying a lead screw coupled to the tool support, a nut actingthereon, a drive shaft, a driven shaft for actuating the nut, gearingbetween said shafts, a clutch for throwing said gearing into and out ofaction, means for setting said clutch into action, and means forautomatically throwing said clutch out of action.

23. In a bolt turning and threading machine, .the combination of a boltblank support, a tool support, turningand threading tools "mountedthereon, means for holding the blank against longitudinal movementmeaeei while producing relative rotation between the bolt blank and thetool acting thereon, and means for producing relative movement betweenthe bolt blank and the tool acting thereon by travel of the tool supportin one direction of length of said blank, said means embodying a leadscrew coupled to the tool. support, a nut acting thereon, a drive shaft,a driven shaft for actuating the nut, a primary transmission shaft,means for driving said primary transmission shaft at varying speeds fromthe drive shaft, a clutch controlled secondary transmission mechanismfor driving the driven shaft from said primary transmission shaft, meansfor setting.

said clutch into action, and means for throwing said clutch out ofaction at the cessation of a tool Working operation on the bolt blank.

24. In a bolt turning and threading machine, the combination of a boltblank support, a tool support, turning and threadin tools mountedthereon, means for holding the bolt blank from longitudinal movementwhile producing relative rotation between the bolt blank and the toolacting thereon, and means for producing relative movement between thebolt blank and the tool acting thereon by travel of the tool support inone direction of length of said blank, said means embodying a lead screwcoupled to the tool support, a nut acting thereon, a drive shaft, adriven shaft for actuating the nut, clutch controlled gearing fordriving the driven shaft from the driving shaft, and means for reversingthe action of the lead screw and nut through said driven shaft.

25. In a bolt turning and threading machine, the combination of a framehaving headstock and tailstock, a non-longitudinally-movable rotaryspindle on the headtion actuated bv stock portion, stock feeding andclamping mechanism associated with the spindle whereby a stockrod may befed up through the spindle and rotated while it is held againstlongitudinal movement, a primary drive mechanism on said head stockportion, a carriage on the tailstock portion movable toward and fromsaid spindle and having a working travel in one direction along thestock rod, a turret on the carriage, turning and threading tools carriedby the turret and adapted to be successively moved into position forrespectively concaving a por tion of the stock and threading the stockon opposite sides of the concaved portion during successive workingtravels of the carriage, a lead screw on the carriage, a gear nut on theframe engaging said lead screw, gearing on the tailstock porsaid primarydrive gearing for actuating said gear nut, and a change g speedmechanism for controlling said gear- 26. In a machine of the characterdescribed, the combination of a frame, a hollow rotary spindle, throughwhich a stock rod is adapted to be passed "and extended in rear of thespindle in the form of a floating end ortion, means associated with thespindle or gripping, releasing and feeding up the stock, and a supportfor the floating rear end of the stock comprising a fixed lower memberhaving spaced supporting rollers, and a movable upper member having aroller on a line between said spaced rollers, and means for securingsaid movable upper member to cause the roller thereon to press the stocklightly against the spaced rollers.

In testimony whereof I aflix my signature.

COl'aUlVfBUS K. LASSITER.

